Cross-site scripting (XSS) vulnerability in Moodle 2.0.x before 2.0.9, 2.1.x before 2.1.6, and 2.2.x before 2.2.3 allows remote authenticated users to inject arbitrary web script or HTML via the idnumber field to cohort/edit.php.
https://moodle.org/mod/forum/discuss.php?d=203055
http://openwall.com/lists/oss-security/2012/05/23/2
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-31691